El profesor se sorprenderá mucho al ver tu solución correcta😉
log(x + 1) - 2*x*x + 1 = 0
x1 = -0.449215282892674
x2 = -0.449215282892851 + 1.63474686072568e-13*i
x3 = -0.449215282892674 - 1.73379454072575e-18*i
x4 = -0.449215282892681 - 1.29798474615433e-14*i
x5 = 0.907075175062694
x5 = 0.907075175062694